Buy a good head unit instead of a Sony. No offense to anyone, but something like the empeg deserves better than a Sony.

Anyway, there are plenty of heads with line-level aux inputs. You should be able to sell your Sony and buy another head without losing the $100+ you'd have to spend on the adapter. Of course if you've got some attachment to the Sony or some other hardware that needs it.... Then you're stuck with the adapter.

Also, I'm pretty sure you won't be able to find the 107 part. There are plenty of threads on the net from people looking but never finding one.

Bruno